Each philosopher is a node in the network and the lines between them (or edges in the terminology of graph theory) represents lines of influence. The node and text are sized according to the number of connections. The algorithm that visualises the graph also tends to put the better connected nodes in the centre of the diagram so we get the most influential philosophers, in large text, clustered in the centre.
Wait. Where’s Ayn Rand? Glenn Beck? Jesus??
This is super neat! I will investigate this a little later.